test2-1 - reasoning in a few words. [2 marks each] (a)...

Chemistry 2000 Spring 2001 Section B Test 2 Aids allowed: Calculator. In particular, periodic tables and other written or printed materials are excluded. Useful data is given at the end of this paper. Answer all questions in the booklet provided. 1. Here is a sketch of the phase diagram of xenon: 125 120 115 110 105 T ( C) P (atm)0 0.5 1 solid liquid gas (a) What is the (approximate) minimum pressure at which solid xenon will melt rather than sublime as the temperature is increased? [2 marks] (b) What is the normal boiling point of xenon? [2 marks] (c) Which is denser, solid or liquid xenon? [2 marks] 2. The equilibrium constant for the water gas reaction C s H 2 O g CO g H 2 g is 2.6 at 1000 K. Suppose that you want to make carbon monoxide and hydrogen, i.e. you want the reaction to proceed from left to right. Give a set of initial pressures of reactants and products such that this will actually happen. [4 marks] 1

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